| 1 |
Combing hair sometimes produces a crackling sound because
|
Of friction between comb and hair <br>
Comb attracts the hair <br>
Electric charge is produce by friction <br>
Of dryness of hair and comb <br>
|
| 2 |
There is along steel pope fixed in a compound, One boy stands at one end of the pipe and places his ear at the end. If another boy strikes the other portion of the pipe, the first boy will hear
|
One sound <br>
Tow sounds <br>
Infinite sounds <br>
No sound <br>
|
| 3 |
The wire of an electric lamp has a
|
High resistance and a high melting point <br>
High resistance and a low melting point <br>
Low resistance and a low melting point <br>
Low resistance <br>
|
| 4 |
The wire in electric fittings are earthed so that
|
Electricity may not leak <br>
There may be a smooth flow of electricity <br>
Current may pass to the earth in case of a short circuit, without doing any harm <br>
To prevent a short circuit <br>
|
| 5 |
Which of the following is a good conductor of heat hand electricity
|
Diamond <br>
Anthracite <br>
Granite <br>
Graphite <br>
|
| 6 |
Focusing in a camera is carried out by varying
|
The amount of light <br>
The distance of the lens form the film <br>
The distance of the lens form the object <br>
The brightness of light and speed of shutter <br>
|
| 7 |
If the sun in shining brightly in one part of the sky after rain. how many rainbows are observed
|
One <br>
Two
Four <br>
Infinite <br>
|
| 8 |
In cold countries glycerol is add to water in car radiators as it helps to
|
Lower the specific heat of water <br>
Lower the viscosity of water <br>
Lower the freezing point of water <br>
improve the lubricity <br>
|
| 9 |
What is the colour of rd rose in green light
|
red <br>
yellow <br>
Black
Blue <br>
|
| 10 |
Good conductors have many loose bounds
|
Atoms <br>
protons <br>
molecules <br>
electrons <br>
|
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